We know that jQuery is a fast and concise JavaScript framework, but What is the jquery plug-in? how to use? This may be a bit confusing, so in this article, I will introduce to you the meaning and usage of jquery plug-in. Friends in need can refer to it.

First of all, let’s take a look at what jquery plug-in means?

jquery plug-ins are tools written by some people using jquery. When we call them, we only need to use very little code to achieve good results. The purpose of writing jquery plug-ins is mainly to provide users with Encapsulate a series of methods or functions so that they can be reused elsewhere to facilitate later maintenance and improve development efficiency.

After reading the meaning of the jquery plug-in, let’s take a look at how to use the jquery plug-in.

Let’s first take a look at the method of calling the jquery plug-in:

1. Extend jquery through $.extend()

2. Add methods to jquery through $.fn

3. Through $.widget () Use jQuery UI component factory method to create

Method 1 cannot call the selector, it is only understood by jQuery as adding a static method, so we do not need to select the DOM object when using it

Let’s take a look at the basic usage of jquery plug-in:

1. It is recommended that the file name of jQuery plug-in be named jquery.[plugin name].js to avoid confusion with other JavaScript Library plugin obfuscation.

2. All object methods should be attached to the jQuery.fn object, and all global functions should be attached to the jQuery object itself.

3. Inside the plug-in, this points to the jQuery object currently obtained through the selector, unlike general methods, such as the click() method, where the internal this points to the DOM element.

4. You can traverse all elements through this.each.

5. All methods or function plug-ins should end with a semicolon, otherwise problems may occur during compression. To be more secure, you can even add a semicolon to the header of the plug-in to prevent other people's irregular code from affecting the plug-in.

6. The plug-in should return a jQuery object to ensure that the plug-in can be chained. Unless the plug-in needs to return some quantity that needs to be obtained, such as a string or array, etc.

7. Avoid using $ as an alias for jQuery objects inside the plug-in. Instead, use complete jQuery to represent it. This can avoid conflicts. Of course, you can also use closure techniques to avoid this problem, so that the plug-in can continue to use $ as an alias for jQuery. Many plugins do this.

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